Abstract
1. The different state of stress and strain of the foundation under the upstream face of the powerhouse and nonoverflow sections of the Bratsk dam determined the different diagrams of the uplift pressure. The seepage heads depend both on the UPL and on the season —the maximum uplift is observed in February-March at a UPL somewhat below the NPL but with a maximum depth of the open joints on the downstream face. 2. The effect of the uplift pressure on a change in the strained state of the contact zone consists in a direct relation between a decrease of the seepage heads and decrease of the tensile stresses or elongation in the region of the contact joint under the upstream face.
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